Fox Launch Pro Knee Guard Features: Pre-Curved Ergonomic Fit Slip-On Fit with Hook-and-Loop Adjuster Perforated Neoprene Offers Comfort and Breathability Certified: EN 1621-1 Level 1 Sold as pair Sizing: (For the best fit, measure your thigh 4" above the knee, and the calf at the fullest part.) Small: Thigh: 14.5" - 15.5"; Calf: 13.5" - 14.5" Medium: Thigh: 15.5" - 16.5"; Calf: 14.5" - 15.5" Large: Thigh: 16.5" - 17.5"; Calf: 15.5" - 16.5" The Launch Pro Knee Guards are trusted by some of the world's best riders. For 2019, they have been fully redesigned with CE certifications. They give you the confidence to attack even the most aggressive trails. They combine the comfort of soft slip-on style guards with the added security of hook and loop adjusters. So you get the perfect marriage of comfort and protection.